1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
  100
  101
  102
  103
  104
  105
  106
  107
  108
  109
  110
  111
  112
  113
  114
  115
  116
  117
  118
  119
  120
  121
  122
  123
  124
  125
  126
  127
  128
  129
  130
  131
  132
  133
  134
  135
  136
  137
  138
  139
  140
  141
  142
  143
  144


ash / utility / cursor_setter.cc [blame]

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ash/utility/cursor_setter.h"

#include "ash/display/screen_orientation_controller.h"
#include "ash/shell.h"

namespace ash {

CursorSetter::CursorSetter()
    : cursor_manager_(Shell::Get()->cursor_manager()),
      original_cursor_(cursor_manager_->GetCursor()),
      original_cursor_visible_(cursor_manager_->IsCursorVisible()),
      original_cursor_locked_(cursor_manager_->IsCursorLocked()) {
  if (!cursor_manager_->IsMouseEventsEnabled()) {
    cursor_manager_->EnableMouseEvents();
  }
}

CursorSetter::~CursorSetter() {
  custom_cursor_params_.reset();
  ResetCursor();
}

void CursorSetter::UpdateCursor(aura::Window* root_window,
                                const ui::Cursor& cursor,
                                std::optional<int> custom_type_id) {
  if (original_cursor_locked_) {
    return;
  }

  if (in_cursor_update_) {
    return;
  }

  base::AutoReset<bool> auto_reset_in_cursor_update(&in_cursor_update_, true);
  const ui::mojom::CursorType new_cursor_type = cursor.type();
  const float device_scale_factor = display::Screen::GetScreen()
                                        ->GetDisplayNearestWindow(root_window)
                                        .device_scale_factor();
  const chromeos::OrientationType orientation = GetCurrentScreenOrientation();
  if (!DidCursorChange(new_cursor_type, device_scale_factor, orientation,
                       custom_type_id)) {
    return;
  }

  if (new_cursor_type == ui::mojom::CursorType::kCustom) {
    custom_cursor_params_ = CustomCursorParams{
        custom_type_id.value(), device_scale_factor, orientation};
  }

  if (cursor_manager_->IsCursorLocked()) {
    cursor_manager_->UnlockCursor();
  }
  if (new_cursor_type == ui::mojom::CursorType::kNone) {
    cursor_manager_->HideCursor();
  } else {
    cursor_manager_->SetCursor(cursor);
    cursor_manager_->ShowCursor();
  }
  cursor_manager_->LockCursor();
  was_cursor_reset_to_original_ = false;
}

void CursorSetter::HideCursor() {
  if (original_cursor_locked_ || !IsCursorVisible()) {
    return;
  }

  if (cursor_manager_->IsCursorLocked()) {
    cursor_manager_->UnlockCursor();
  }

  cursor_manager_->HideCursor();
  cursor_manager_->LockCursor();
  was_cursor_reset_to_original_ = false;
}

void CursorSetter::ResetCursor() {
  // Only unlock the cursor if it wasn't locked before.
  if (original_cursor_locked_) {
    return;
  }

  // Only reset cursor if it hasn't been reset before.
  if (was_cursor_reset_to_original_) {
    return;
  }

  if (cursor_manager_->IsCursorLocked()) {
    cursor_manager_->UnlockCursor();
  }
  cursor_manager_->SetCursor(original_cursor_);
  if (original_cursor_visible_) {
    cursor_manager_->ShowCursor();
  } else {
    cursor_manager_->HideCursor();
  }
  was_cursor_reset_to_original_ = true;
}

bool CursorSetter::IsCursorVisible() const {
  return cursor_manager_->IsCursorVisible();
}

bool CursorSetter::IsUsingCustomCursor(int custom_type_id) const {
  return cursor_manager_->GetCursor().type() ==
             ui::mojom::CursorType::kCustom &&
         custom_cursor_params_->id == custom_type_id;
}

bool CursorSetter::DidCursorChange(
    ui::mojom::CursorType new_cursor_type,
    float device_scale_factor,
    chromeos::OrientationType orientation,
    const std::optional<int> custom_type_id) const {
  const ui::mojom::CursorType current_cursor_type =
      cursor_manager_->GetCursor().type();

  if (current_cursor_type != new_cursor_type) {
    return true;
  }

  // We use `kNone` as a signal to hide the cursor. See `UpdateCursor()`.
  bool visibility_changed = cursor_manager_->IsCursorVisible() !=
                            (new_cursor_type != ui::mojom::CursorType::kNone);

  if (visibility_changed) {
    return true;
  }

  if (current_cursor_type == ui::mojom::CursorType::kCustom) {
    CHECK(custom_type_id);
    return (custom_cursor_params_ != CustomCursorParams{custom_type_id.value(),
                                                        device_scale_factor,
                                                        orientation});
  }

  return false;
}

}  // namespace ash